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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544a26bfd2bc06d1dd2d470b4559c6680aa94bfd3a7b24ba74f3d48bff685322' 
  AND token = '19fdyM5fobmX88ZYv1BnKDubb1IEKyRaur1K6F7yLUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}